摘要
讨论了三能级原子在消逝波光场作用下的Ｓｉｓｙｐｈｕｓ冷却和几何冷却机制， 通过蒙特卡罗（Ｍｏｎｔｅ－Ｃａｒｌｏ）方法分别模拟了消逝波光场在方锥形势阱和圆锥形势阱两种情况下对原子冷却的动力学过程， 并计算了原子在不同的失谐量、激光功率及消逝波的判断宽度下的冷却情况。结果表明， 增大消逝波的激光功率能有效地减少原子的损耗， 但对冷却结果影响不大； 而消逝波的判断宽度不够宽时， 结果偏差较大； 对于方锥形势阱， 失谐量越小， 原子的最终温度也越低； 在其它条件相同的情况下， 方锥形势阱比圆锥形势阱更有效， 原子能达到更低的温度和更高的密度， 因而在原子光学， 如原子干涉仪、原子激光等应用中更为有用。
An efficient Sisyphus cooling and geometric cooling of three level atoms in blue detuned evanescent light wave are discussed, and the kinetics processes of atom cooling in a pyramidal and conical hollow trap is studied by Monte Carlo simulation.The results shows that (1) the atom loss rate is decreased with the increase of evanescent wave laser power, (2) the final equilibrium temperature of atoms in the pyramidal trap is decreased as the reduce of detuning δ, and (3) there is a larger error between the Monte Carlo results and theoretically estimated ones when the judged width of evanescent light wave is not wide enough. In addition, under the same conditions, the pyramidal atom trap is more efficient than the conical atom trap, which can obtain a lower atomic temperature and higher atomic density.
出处
《光学学报》
EI
CAS
CSCD
北大核心
1999年第12期1585-1591,共7页
Acta Optica Sinica
基金
江苏省和国家自然科学基金
关键词
原子冷却
消逝波光场
重力光学势阱
蒙特卡罗
atom cooling, evanescent light wave, atom trap, Sisyphus cooling, Monte Carlo simulations.
